as the question implies, what would you do if you had the power of the geass? i would probably use it to control mi teachers and make them not give out any homework and make me pass with 100%, lol... and then just use it on ppl for fun and make them do whatever i want

If I had the geass's power like Lelouch's...I'd use it on my teachers to pass my all the time like a B or a C is good...I don't care as long as I get good grades.

OR...use it on myself. Like...every time there's a test coming, I will always study beforehand and also when the teachers give out homeworks or any kinds of work, I will always do it. (Yea...coz I'm a procrastinator...so having myself to do that is actually a big help. xDD)

If I get to have the mind reading one...I'd black mail my teachers on what's in their mind...hohohoho~ xDD